<template>
	<view>
		<!-- native 给组件的根元素注册原生事件 -->
		<my-search @click.native="gotoSearch" :bround="'15px'" :bgColor="'#c00000'"></my-search>
		<!-- 分类导航 -->
		<view class="scroll-view-container">
			<!-- 左侧分类导航 -->
			<scroll-view class="left-scroll-view" scroll-y :style="'height:'+wh+'px;'">
				<view class="left-scroll-view-item" v-for="(item,i) in cateList" :key="item.cat_id"
					:class="{active:active===i}" @click="changeActive(i)">{{item.cat_name}}</view>
			</scroll-view>
			<!-- 右测 二三级分类 -->
			<scroll-view class="right-scroll-view" scroll-y :style="'height:'+wh+'px;'" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateList2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<view class="cate-lv3-list">
						<navigator :url="'/subpkg/goods_list/goods_list?cat_id=' + item3.cat_id" class="cate-lv3-item"
							v-for="(item3, i3) in item2.children" :key="i3">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</navigator>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>
<script>
	import badgeMixin from '../../mxins/tabbar-badge.js'
	export default {
		mixins: [badgeMixin],
		data() {
			return {
				cateList: [], //分类列表
				cateList2: [], //二级分类数据
				active: 0, //记录一级分类高亮的索引
				wh: 0, //可视 区域高度,
				scrollTop: 0
			};
		},
		onLoad() {
			this.getcateList();
			// 获取可视区域高度
			const windowInfo = uni.getWindowInfo()
			this.wh = windowInfo.windowHeight - 50
		},
		methods: {
			// 获取分类数据 
			async getcateList() {
				const {
					data
				} = await uni.$http.get('/categories')
				this.cateList = data.message
				this.cateList2 = data.message[0].children
				console.log(this.cateList)
			},
			// 设置切换高亮效果
			changeActive(i) {
				this.active = i
				this.cateList2 = this.cateList[i].children //关联二级分类数据
				this.scrollTop = this.scrollTop === 0 ? 1 : 0 //切换一级分类重置 3及
			},
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>
<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}

		.right-scroll-view {
			.cate-lv2-title {
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px 0;
			}

			.cate-lv3-list {
				display: flex;
				flex-wrap: wrap;

				.cate-lv3-item {
					width: 33.33%;
					margin-bottom: 10px;
					display: flex;
					flex-direction: column;
					align-items: center;

					image {
						width: 60px;
						height: 60px;
					}

					text {
						font-size: 12px;
					}
				}
			}
		}
	}
</style>
